Sen. Kirsten Gillibrand, D-N.Y., has vowed to no longer accept campaign contributions from corporate PACs, she announced Tuesday.

With the new pledge, taken in conjunction with the group End Citizens United, Gillibrand became the fourth sitting U.S. senator to reject corporate PAC money, joining Sens. Bernie Sanders, I-Vt., Elizabeth Warren, D-Mass., and Maria Cantwell, D-Wash.

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“Because of the corrosive effect of corporate money in politics, I’ve decided from this point on I am no longer accepting corporate PAC checks into my campaign,” Gillibrand said in a video announcing her decision. “We have a system where corporations can spend unlimited money that isn’t even disclosed, so there’s no transparency.”

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According to Open Secrets, which tracks campaign contributions, the Democratic senator accepted $4.9 million from business PACs from 2005-2018. Gillibrand said her worry about corporate money in politics stems from the 2010 U.S. Supreme Court ruling in Citizens...